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In the early 18th century, during the reign of King Yeongjo of the Joseon Dynasty (played by Song Kang-ho), the king was deeply devoted to his son. After the early death of his eldest son, he placed all his hopes on his second son, Prince Sado (played by Yoo Ah-in). Not only was the prince crowned Crown Prince at his birth, but the king also arranged for prominent ministers to oversee his education. However, fate did not align with the king's wishes. The Crown Prince was preoccupied with pleasure and had no interest in his studies. King Yeongjo once appointed the Crown Prince to temporarily manage state affairs, but this only drove the father and son further apart. On a rainy night, the Crown Prince entered the royal palace wielding a sword. The next day, he was reprimanded by the king for attempting rebellion and was locked in a rice chest. Over the following eight days, the father and son, who had become as hostile as enemies, each recalled their past experiences. Perhaps it would have been better if they had been ordinary father and son. The most cruel events in the inner palace occurred between the closest of people...